diff --git a/src/HashedSearch.php b/src/HashedSearch.php
index bada3b8..b3b368d 100644
--- a/src/HashedSearch.php
+++ b/src/HashedSearch.php
@@ -28,7 +28,7 @@ public function __construct(array $config)
     }
 
 
-    public function create(string $value, string $saltModifier = ""): ?string
+    public function create(?string $value, string $saltModifier = ""): ?string
     {
         //Nothing to hash here!
         if (strlen($value) === 0 || $value === null) {